Sheet metal mixer for gas burners



Oct. 13, 1953 F. c. NEULS 2,655,210

v SHEET METAL MIXER FOR GAS BURNERS Filed Oct. 4. 1950 2 Sheets-Sheet 1 Fig. 3

Inventor Frederick 6. News Oct. 13, 1953 F. c. NEULS 2,655,

SHEET METAL MIXER FOR GAS BURNERS Filed Oct. 4, 1950 2 Sheets-Sheet 2 Inventor Frederic/r 6'. Meals Patented Oct. 13, 1953 Frederick C. Neuls,-.Burlingt'on;.

Vt. assi'gnor. to

The G. .S..Blodgctt 00., Inc;,. Burlington, Vt, a corporation of Vermont Application'flctob'er, 1950, Serial No. 188,362

3. Claims. (Cl. 1'58-II-8)= This invention relates to certain newand use ful improvements in gas burnersof atmospherictypes and has more particular reference to a novelly constructedburnerring and-anequal1y novel complementa'l air and gas mixing unit which is attachable to said burner ring.

An object of'this invention is to provide an improved burner ring withagas and air chamber" made of inexpensive construction in that there are two ring components or sections-joined together by welding, oneof which is provided-with a number of ports to accommodate port tips and the other of; which is provided with an opening with a baflie thereover, said opening having an air and gas mixer in registry therewith; the mixer being of improveddesignin that it, is madeofz two sections which, when. connected together, form a conduit.

Another object of this invention isto provide animprovement in the air mixer in the manner of supporting the air shutter nipple in a ring-v 01 collar of a yoke, the yoke having its. ends disposed in pockets formed by offsets in themounting flanges for the sectionsofthe'air and gas mixer.

Other objects will become apparent in following the description of the illustrated form-of the:

invention.

In the drawings:

Figure 1- is a plan view of the" assembly, someofthe port tips and ports being omitted;

Figure 2is a front view of the'device-in Fig ure 1;

Figure 3 is an enlarged transverse: sectional view taken substantially on'the line 33 of-Figure 1' and illustrating the port tip, baffle and:airgas mixer assembly at their respective connections;

Figure i is a sectionalview taken substantially on the line-:F-kof Figure 3and the direction of the arrows;

Figure 5 is an exploded perspective view of thecomponent parts'of the device; and;

Figure 6' is a fragmentary perspective. view of the outer end' of the air mixer assembly, the shutters. and the means of retaining the shutters in place being omitted.

The illustrated burner construction has been designed primarily for use with the stove construction-illustrated in my co-pending application, Serial No. 188,361, which was filedv on October 4, 1950, although the burner construction is of general application and utility. As is apparent from the drawings the burner assembly employs any standard type of gaseous fuel.

2. The assembly consists of two main portions, the burner generally indicated at- I 0" and the air or air-gas mixer I22 The burner consists-of an upper burner ring- Wwhich is substantially channelshaped in cross section and which has laterally-projecting flanges IE and lfl at the edges thereof". Thelower ring 20 isalso substantially channel shaped in cross section and has the flanges 22 and'24' extending'f'romthe edges thereof. The flanges l8 and IE are disposed upon the flangesz i and 22so-that junctions Zii-and. 28-maybeformed by welding (Figure 3); Thisdefi'nes the fuel chamber 30- within the-burnerring assembly.

The upper ring is provided with a number of" ports 32' into-which port tips 34 are fittedand then welded. The tips have reduced lower necks 3 6 (Figure -3 which fit directly in the ports 3 2 for facilityin joining't-hetips firmly to the upper ringl4.

There is an opening 38 punched or otherwise formed inthe bottom of the lower ring 20 so that the discharge end of the air mixer I!" may beheld in registry therewith. A flange 40' is provided'at saiddischarge end-of the air mixer andi's welded'te'thebottom surface of" the lower burnerring 20 (Figures 3 and- 4) whereby the mixture of gas-'and-air passing through'the opening 38 may impinge upon the baffle fl'which is:

disposed in the fuel chamber 30'. Thisbafile is welded to thesides of the upper ring 14' and extends a short distance in the fuel chamber 30 was to direct the fuel-and air in a circular. travel as disclosedby the arrows in Figure 4.

The air' mixer I2 is of Venturi shape with anelbow d'fi at' oneend thereof. It is at the upper end oftheelbow' ifi that the flange 4B, constituting a seat, is provided. As disclosed in-Figure 5 the air mixer'is formed of two longitudinal sections, each section being concave so that when the sections are-joined'together the Venturi shape conduit is formed. A p'airof'ffanges 48 and 50; respectively, are provided on the edges of' the section 52, While the flanges 54 and 56 are provid'ed on theedges'of' the-section 58; The outer end of each section 52 and 58, respectively, 00-- opcrates to form an-air scoop or air inlet funnel 60- and the flangesof each section extend outwardly sufficiently far to be locatedon the air scoop. The-flanges extend inwardly sufli'cientlyfar to join with the flange 40. Accordingly the" sections are placed together so that the flanges confront and then the flanges are welded together in the assembly of this portion of the air mixer. The flanges are provided with ofisets 62, 64,

68 and 68 at their outer ends, the offsets G2 and 66 cooperating to form a pocket while the offsets El and 68 cooperate to form a pocket or socket for the yoke halves l0 and 12.

The yoke halves are placed together to constitute a yoke and define the collar or ring 14 in the center thereof. This collar is fitted in a groove 16 of the air shutter nipple 18 which is threaded on its outer end so that the shutter assembly 80 may be threadedly secured thereto.

In order to hold the air scoop 60 end of the air mixer assembled properly the yoke is simply inserted in the pockets after the collar M has been disposed in the groove 16, this holding the nipple l8 concentrically arranged with the outer edge of the scoop or air inlet member 60.

As disclosed in Figure 6- an abutment is formed by the flanges 82 and 84, one of which is provided on the outer end of each section 52 and 58, so that the shutter assembly 80 may be screwed tightly thereagainst.

The aforementioned port tips 34 are in actual practice produced from stainless steel rod which is axially bored and has one end reduced to provide the aforementioned assembling and retaining neck 36. The necks project into the punched ports and are preferably welded and thus securely anchored in place.

Both upper and lower ring sections are dieformed from cold rolled steel sheet of prescribed gauge. The lower ring section is punched, as shown, at a point wherethe elbow of the air mixer unit or conduit is assembled and joined. As explained, the sections are assembled by gas welding the flanges together at the points of abutment on both inner and outer peripheral portions. Prior to assembly, a bafile plate, of the shape shown, is welded in place at the top section so that it will line up with the underlying opening in the lower section. The obvious function of the bafiie is to diverge a direct flow of incoming fuel so that it will be properly distributed in the circulating chamber.

It is repeated that the air mixer conduit or unit is likewise characterized by semi-circular half-sections which are die-formed of cold rolled sheet steel of prescribed gauge requirements. Flange means is provided on the inner elbow end for attachment to the burner ring by way of welding and flange means is provided on the mouth portion of the conical funnel to properly accommodate the shutter assembly means 80. The yoke halves are formed of duplicate components bent between their ends to provide the desired nipple encirclement and retaining means, the end portions being conveniently seated in the recesses or pockets for expeditious assembling and welding.

Having described the invention, what is claimed as new is:

1. An atmospheric air and gas mixer unit for a burner ring comprising an L-shaped conduit embodying elongated duplicate half-sections of semi-circular cross-section having lengthwise outstanding marginal assembling flanges, th respective flanges being matched, abutted, and welded together, the inner end of said conduit providing a lateral burner ring attaching elbow,

the latter being also provided with flanges for welded connection with said ring, the outer end of said conduit having an integral conical air and gas intake funnel, the intake end of said funnel having complemental outstanding marginal flanges, the terminal ends of said marginal flanges at the mouth of said cone being offset and spaced apart and providing diametrically opposite recesses, a two-part yoke, the parts thereof abutting each other and providing a nipple encircling band and attaching ends for said yoke, the respective attaching ends being seated in said recesses, and a concentric screw-threaded nipple having one end embraced by and attached to said band, and said attaching ends being welded in said recesses and thus serving to assemble and join said yoke with said cone and said nipple with said yoke.

2. An atmospheric air and gas mixer unit for a burner ring comprising conduit embodying elongated duplicate companion half-sections having lengthwise outstanding marginal assembling flanges, the respective flanges being matched,

. abutted and welded together, the inner end of said conduit have means for attachment to the stated burner ring, the outer end of said conduit having integral conical air and gas intake funnel, the intake end of said funnel being provided with a pair of diametrically opposite pockets respectively in alignment with the adjacent terminal ends of the respective lengthwise assembling flanges, a nipple and yoke disposed axially of said funnel, said yoke having a circular band portion encircling and attached to the inward end of said nipple and having diametrically opposite attaching ends radiating from said band portion and seated in and anchored in said pockets.

3. A gas and air mixer having lateral means at one end thereof for fastening said mixer in registry with an opening in a gas burner ring, said mixer being a conduit and including a pair of longitudinal sections, each section having a pair of flanges extending longitudinally thereof, the flanges on one section being welded to the flanges of the other section, a flared air funnel secured to the opposite end of said conduit, the flared intake end of said funnel having outstanding semicircular coplanar marginal flanges, the adjacent ends of said latter flanges being spaced apart and having terminal offset portions joined with the adjacent terminal ends of said longitudinally extending flanges and. defining a pair of diametrically opposite pockets, a nipple disposed axially in respect to said funnel and having a circumferentially grooved inward end portion, and a nipple assembling and anchoring yoke, the latter embodying a central circular band portion encircling the nipple and seated in the circumferential groove and also embodying attaching ends, the latter being seated and anchored in said pockets.

FREDERICK C. NEULS.

References Cited in the flle of this patent UNITED STATES PATENTS Number Name Date 796,924 McCartney Aug. 8, 1905 1,260,442 Pickup Mar. 26, 1918 1,785,900 Hamberger Dec. 23, 1930 1,809,425 Roberts June 9, 1931 2,348,011 Koppel May 2, 1944 2,372,953 Hurlbut et al Apr. 3, 19%

FOREIGN PATENTS Number Country Date 210,301 Great Britain Nov. 7, 1923 

